Add test

tests/unit/wiring/test_inject_and_wraps_decorator_py36.py

@@ -0,0 +1,49 @@
+"""Test that @functools.wraps decorator works properly with the wiring.
+
+See issue #453 for details: https://github.com/ets-labs/python-dependency-injector/issues/454
+"""
+
+import functools
+
+from dependency_injector.wiring import inject, Provide
+from pytest import fixture
+
+from samples.wiring.container import Container
+
+
+@fixture
+def container():
+    container = Container()
+    yield container
+    container.unwire()
+
+
+def decorator1(func):
+    @functools.wraps(func)
+    @inject
+    def wrapper(value1: str = Provide[Container.config.value1]):
+        result = func()
+        return result + value1
+    return wrapper
+
+
+def decorator2(func):
+    @functools.wraps(func)
+    @inject
+    def wrapper(value2: str = Provide[Container.config.value2]):
+        result = func()
+        return result + value2
+    return wrapper
+
+
+@decorator1
+@decorator2
+def sample():
+    return 2
+
+
+def test_wraps(container: Container):
+    container.wire(modules=[__name__])
+    container.config.from_dict({"value1": 42, "value2": 15})
+
+    assert sample() == 2+42+15